Ion source
US4453078A · kind A · utility
12Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Jun 7, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J37/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A reservoir, extracting electrode and circular tungsten filament are maintained at high positive D.C. potential relative to a grounded electrode. Thermal electrons emanated from the filament irradiates and heats the bottom of the reservoir. As a result, powdered CsI held in the reservoir is melted and then forms a liquid CsI cone-shaped portion below the capillary formed at the reservoir bottom. Vaporized CsI molecules are created by further heating the cone-shaped portion, and are ionized by electron beam irradiation, so that a Cs.sup.+ ion beam is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.